Propagate ingress label from route label

[nak3]

Proposed Changes

This patch changes to propagate ingress's labels from parent Route's label.

Fixes #5462

/lint

Release Note

NONE

[knative-prow-robot]

@nak3: 0 warnings.

In response to this:

Proposed Changes

This patch changes to propagate ingress's labels from parent Route's label.

Fixes #5462

/lint

Release Note

NONE

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[nak3]

/test pull-knative-serving-unit-tests

[tcnghia]

@nak3 do we already filter out kubectl last-applied label? It's possible to create Route directly, hence possible to have that.

[nak3]

@tcnghia Oh, Nice catch! ingress does not have the filter for last-applied. But it is annotation, not label. So, I will file separate PR with the unit tests.

[knative-metrics-robot]

The following is the coverage report on pkg/.
Say /test pull-knative-serving-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/reconciler/route/resources/ingress.go	79.7%	84.7%	5.1

[tcnghia]

/lgtm

[tcnghia]

/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nak3, tcnghia

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[knative-test-reporter-robot]

The following jobs failed due to test flakiness:

Test name	Triggers	Retries
pull-knative-serving-integration-tests	pull-knative-serving-integration-tests pull-knative-serving-integration-tests	2/3

Automatically retrying...
/test pull-knative-serving-integration-tests